Can I Mix Disc Blade Brands on the Same Harrow?

Question we get a lot: "I need 24 blades but you're only in stock on 12 — can I fill the rest from another supplier?" Short answer: yes, if the specs match exactly. The blade brand doesn't matter as long as diameter, thickness, alloy, edge, and axle-hole are identical. The failure mode is mixing specs, not mixing brands.

What you can mix

  • Brands. Two blades from different aftermarket suppliers that both match your OEM spec will perform identically. The mill that made them may be the same anyway — a lot of aftermarket blades come from the same handful of large steel mills.
  • Colors of paint. Some blades come painted black, some red, some unpainted. Purely cosmetic; wears off in an acre.
  • Stampings. Different brand marks near the axle hole don't affect performance.

What you can't mix

  1. Diameters. Even 1/2" difference will cause the smaller blades to underperform on cut depth and stress the gang bolt as it torques against unequal masses. Never mix diameters within a gang.
  2. Thicknesses. A 6mm blade next to an 8mm blade has different mass, different wear rate, different flex. Bad idea within a gang.
  3. Alloys. Boron and carbon blades wear at different rates. Mix them today and in a year the boron blades will be measurably bigger than the carbon blades in the same gang.
  4. Concavities. Different concavity = different soil-throwing behavior. The gang won't roll evenly.
  5. Edge types within a gang. Don't alternate notched and smooth in the same gang. Notched all front, smooth all rear — but never mixed on one axle.
Not sure it fits your machine? Text a photo of your old blade to 515-686-5575 — we'll cross-check the diameter, thickness, and axle-hole shape against our catalog before you order. Same-day ship on orders placed by 12pm CT.

The one exception: end blades

Many disc harrows use a shorter or specially-cut "end blade" on the outboard end of each gang. This blade IS a different spec than the rest. If your gang has an end blade, order it as a distinct part, not the same as the run of the gang.

Emergency partial replacement

You're in the field, a blade shatters on a rock, and you need to keep going. Rule of thumb: it's OK to run one mismatched blade for the rest of the day if it's the same diameter as the others. Beyond one blade, the gang balance gets bad enough to stress the bolt. Order a matched set the same evening and swap in the replacements before your next big pull.

Cross-brand fitment is common

Manufacturers all buy from the same mills. A blade sold under one brand often has an identical twin under another brand — same alloy, same heat treat, same punch. This is fine. It also means that when a supplier is out, a different-branded blade with the identical spec is a true drop-in replacement.

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Frequently Asked Questions

Can I put aftermarket blades on an OEM-branded harrow?
Yes, if the specs match. Same diameter, thickness, alloy, center hole, edge. Manufacturers of major harrow brands mostly buy blades from the same steel mills as the aftermarket, so it's frequently the same blade under a different sticker.
Will mixing blade brands void my warranty?
Not on our end. On your machine's warranty — check your OEM policy, but most disc harrow warranties cover the frame and gang bearings, not the blades themselves (blades are considered wear items).
What if I can only find 30 of the 32 blades I need in one order?
Split the order. Take the 30, then order 2 more from a second supplier as long as the specs match. Or order all 32 from us and we'll drop-ship the missing 2 direct from the mill when they come in.
Can I run one thickness on the front gang and another on the rear?
Not without stressing the machine. The gangs are supposed to balance, and thickness affects mass. Match thickness across all four gangs.
Is there a case where I should intentionally mix?
One: some operators run notched on the front gangs and smooth on the rear — that's the OEM design, not a mix. Beyond that, no — keep specs uniform within each gang.